Look for a used one with land. The land is where the value is. Check what mh lots are renting for near the area you are looking at, to help value the land. Now, if the land can be subdivided, look at making mh park, then at a sale/rent of the mh and small lot, out of original tract.
No resale value
Lot rent same as property taxes on standard home, and it goes up every year
Homes very close to one another
You cannot fence your yard for your dog
Cabinets are cheap and cheesy
Walls are very thin
Appliances are low grade
OK if you are a single senior citizen and can afford the monthly lot rent, lawn mowing and snow removal. When you die, your home has very little value, if you can sell it at all.
The materials used to build a "throw away" shelter are not the quality of site built homes. Specifically designed to last around 25 yrs and then be thrown away and a new one purchased. That is why they cost so much less than a site built homes.
Resale is extremely hard, almost no market. Many double wides available set up in parks for less than $25,000 in my area. Would you purchase a used mobile home you know is past half it's life expectancy?